640325 has 12 divisors (see below), whose sum is σ = 907680. Its totient is φ = 438960.

The previous prime is 640307. The next prime is 640333. The reversal of 640325 is 523046.

It is not a de Polignac number, because 640325 - 2⁶ = 640261 is a prime.

It is a super-2 number, since 2×640325² = 820032211250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640297 and 640306.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 640325.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1655 + ... + 2004.

It is an arithmetic number, because the mean of its divisors is an integer number (75640).

2⁶⁴⁰³²⁵ is an apocalyptic number.

It is an amenable number.

640325 is a deficient number, since it is larger than the sum of its proper divisors (267355).

640325 is a wasteful number, since it uses less digits than its factorization.

640325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676 (or 3671 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 640325 is about 800.2030992192. The cubic root of 640325 is about 86.1919724510.

The spelling of 640325 in words is "six hundred forty thousand, three hundred twenty-five".